<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>dom node exercise</title>
    <script src="dom.js"></script>
</head>
<body>
<div>cccccccccccccc</div>
<div id="div" style="background-color: red" draggable="true">a</div><!--comment-->
<p>sdfsf</p>
</body>
<script>
    var div = document.getElementById('div');
    l(isElement(div));
    l(isElement(div.nextSibling));
</script>
</html>